Study on the Microstructure,Properties,and Heat Treatment of Additive Remanufactured 30CrMo Plates with Prefabricated Groove Using CMT Process
Aiming to the remanufacturing of the parts manufactured by 30CrMo,a prediction model for the width of the prefabricated groove was derived on the basis of width and height,and contour model of single weld bead.Remanufacturing experiments for 30CrMo plates with optimized prefabricated grooves width were carried out using cold metal transfer(CMT).The microstructure characterize of the cladding was observed using metallographic microscopy and scanning electron microscopy.Meanwhile,the tensile mechanical properties was tested using universal testing machine.The results show that the CMT additive remanufactured layer is continuous,without macroscopic defects,and has good fusion with the base material.The cladding layer is mainly composed of ferrite and granular bainite,and that a large amount of block like carbides are distributed at grain boundaries,while fewer carbide particles inside the grains.As to the heat treated cladding,the size of ferrite increases obviously,while the size of blocky carbides on grain boundaries increases and its dispersion decreases.The transverse tensile strength of the remanufactured specimens is better than that of the longitudinal.The yield strength and tensile strength of the longitudinal tensile after heat treated are 592 MPa and 736 MPa.Those are about 90.8%and 90.7%of the 30CrMo base material.Hence,the established model is reasonable.The outcomes of present study provide data support for the shape and property control of the remanufactured 30CrMo parts with volumetric defects.
cold metal transfer(CMT)30CrMoremanufactureheat treatment
万方数据
维普
